Blender 2.8 transparency & volumetrics?
Answer has been found here.
https://blenderartists.org/t/transparent-materials-workflow-from-cycles-to-eevee-from-2-79/1129207/5

TL;DR
Enable screen space refractions in your material under options.
Leave blend mode on opaque.
Ënable screen space reflections in your render settings under screen space reflection.